Automatic stop mechanism for phonographs



March 5, 1929.

1'. 1.. SCHOWENGERDT AUTOMATIC STOP MECHANISM FOR PHONOGRAPHS FiledApril 16. 1928 2 sheeyysneet 1 Inventor March 5, 1929. r. L.SCHOWENGERDT AUTOMATIC STOP MECHANISM FOR PHONOGRAPHS Filed April 16,1928 2 Sheets-Sheet [Ill/l Il/l/ I4 Inventor [I Joawe/yera f 1 I JWWttorng Patented Brian 5, 19229.

were srras THEODORE LOUIS SCHOVJEIIGERDT,YOF GEBO, WYOMING AUTOMATICs'ror mncnanrsm non rnonoonnrns."

Application filed April 16,

The present invention relates to improve ments instop mechanisms forphonographs and has for its principal object to provide a means forefficiently stopping the turn table of the phonograph after thereproducer carried bythe tone arm has traversed the record supported onthe turn table. One of the important objects of the present inventionisto provide a stop mechanism for phonographs that can be readily andeasily installed without necessitating any material alterations of theparts of the phonograph with which said stop mechanism is adapted to beassociated, additional means being provided for setting the stopmechanism depending, upon the particular character of record that isplayed on the phonograph. A

further object is to provide a stop mechanism for phonographs off theabove mentioned character whereby the brake can bcbrought into engagement'with the rotatable turn table without causing any injury ordisruption of the parts of the stop mechanism that operateautomatically. Still a further object to provide a stop mechanism whichis simple in construction, inexpensive, strong and durable and furtherwell adapted to the purpose for which it is designed. Other objects andadi' antages of the invention will become apparent from the followingdescription when taken in connection. with the accompanying drawings. V

In the accompanying drawings wherein like reference characters indicatecorresponding parts throughout the several views: v t

Figure 1 is a "fragmentary top plan view of the rotatable turn table ofa'phonograph, showing my improved stop mechanism that is arrangedbeneath the turn table.

Figure 2 is a sectional view taken approxin'iately on the line 2-2 of ligure 1 showing the stop mechanism in side elevation.

Figure 3 is a detail perspective view of the L-shaped member thatcooperates with the depending 'pin carried by the movable tonev arm. 7 I

Figure it is a detail perspective view of the pivoted lever forming apart of the stop mechanism.

Figure 5 is a similar view of the brake. unit, and

192s. Serial 1%. 270,321.

Figure 6 is a detail perspective view the trip and the ad ustmg rodtherefor. i

In the drawings wherein for the purpose of illustration is shownthepreferred embodiment of my invention, the numeral 1 designates aportion of the rotatable turn table of a phonograph that is mounted inspaced relation upon a suitable support 25 the record engaging pin 8extending upwardly from the support through the turntable in then'ianner as clearly shown in the drawing. 7

mediate portion of this arm is bent upwardly as at 1Q so that theouterend' portion of this arm will be disposed above the planeof theinner endportion oi said arm and as is clearly shown in Figures 1 and 3of the draw ings, the outer end of this arm is formed with alongitudinally extending slot 11 to receive the lower end of thedepending pin 6 carried by the movable tone arm 5. Thus the L-shapedmember Twill be adapted for simultaneous movement with the tone arm 5and the reproducer carried thereby.

An elongated flat rod 12 is secured atits inner end on the upper face ofthe support 2 adjacent the center of the turn table as at 13, and thisred or arm 12 carries at its outer end a cross piece 14, the outerlongitudinal edgcot' which is formed with the ratchet teeth 15 asclearly shown in Figure 1, The nier cnd of the pivoted rod 12 terminatesinwardly of the flanged outer edge ofthe turn table 1. An elongated link16 afiords an operative connection between the outer end of the shorterarm 17 of the pivoted L-shaped member 7 and 18 that is formed at itsinner end with a E 9(- mental head portion 19 for disposition lie--neath the turn table 1 adjacent the outer flanged edge thereof, and thislever is pivoted at its inner end on the support 2, as at 2() The outerend portion of the lever is disposed upwardly and thence laterally toform a handle 21 that is arranged exterioriy of the turn table and alongitudinally eE-Itend ng slot is formed in the handle portion 21 for apurpose hereinafter to be more fully eescrihcd. The curved edge of thesegmental head 19 is formed with the teeth 23 that engage with the teeth24 formed in the curved edge of the segmental inner end portion of thebrake carrying plate 26 and this plate is also pivotally supported atits inner end on the support 2 as at 27. A brake element- 28 is carriedby the outer end of his plate 26 for cooperation with the inner face ofthe annular flange 4: that depends from the outer edge of the retatableturn table 1 and the specific construction of the brake unit is moreclearly illus trated in Figure of the drawings. A slot 29 of arcuateformation is formed in the segmental head portion of this plate 26 andextenoing upwardly through this slot from the support 2 is a pin 30. Aspring 81 is socured at one end to the upper end of the pin. 30 and atits other end to the intermediate portion of the plate 26 for normallyholding the brake element 28 inwardly and out of engagement with respectto the flange 4 of the turn table 1.

A lateral extension 32 is formed on the inner edge of the plate 26adjacent the segmental head and carried by this extension is the pivotedpawl 33, the same being pivoted intermediate its ends and the inner endof this pawl is adapted for cooperation with the ratchet teeth 15 formedin the outer longitudinal ed .ge of the cross member 1 1- arranged onthe outc end of the pivoted rod 12., A hravy leaf spring 8 1 is arrangedon the plate 26 for en en gement with the outer end of the pivoted phwlon one side thereof. a lighter spring 85 being disposed on the oppositeside of the )ivoted pawl as shown very clearly in Figure 5.

The springs cooperate to prevent any injury or disruption of the partsof the stop ineirhanisni should the operator forcibly ar tuate thebifilii mechanism by hand the purpose of l he light spring being tomaintain the pivoted pawl in operative rela ion with "e spect to theheavy spring "l L-shaped trip member designated generally by the numeral2-35 is pivoted at the pmcture of the longer arm with the shorter arm onthe segmental head 19 of the lever 18 the longer arm 37 extendinginwardly and, being adapted for cooperation with one end of the toothedcross member 14 on the outer end of the pivot ed bar 12. The shorter arm38 of this L-shapedtrip 36 is pivotally secured to the inner end of arod 39 that extends along the upper face of the inner end portion of thepivoted lever 18, the outer portion of this rod being slidable throughthe vertically disposed portion of the lever through a suitable openingprovided therefor in said vertical portion. As is more clearlyillustrated in Figure 8 the outer end of this rodBS) is bent upwardlyand the upwardly disposed outer end portion of the rod is designated bythe numeral 40. The upwardly disposed portion 40 extends through theslot 22 formed in outer end portion of the pivoted lever 18 and threadedon the outer extremity of this portion of the rod is a head ll that isadapted for slidable movement along the upper face of the outer endportion of the lever.

A spring 42 encircles the upwardly disposed outer end portion -11) ofthe rod 39 and is disposed between said rod and the bottom of the handleportion 21 of the lever 18 for holding the head 11 against casualsliding movement and furthermore by tightening the head 41 sothat thesame will be maintained in locked engagement with the handle portion 21of the lever 18, the trip member 36 may be adjusted with respect to thecross member let on the outer end of the pivoted bar 12. The operationof my stop mechanism may be briefly stated as follows. With the partsarranged shown in Figure 1 of the drawings it will be. readily obviousthat the Lshaped member 7 pivot 8 simultaneously with the movement ofthe tone arm 5 across the record that is being played and during theswinging movement of the L-shaped member 7 in the direction indicated bythe arrow, the pivoted bar 12 will move in the direction indicated bythe arrow in Figure 1 so that the end of the cross member 19 that is inengagement with the free end portion of the longer arm 32? of theL-sliaped trip 36 will swing the lever 18 on its pivot 20 and the teeth2301" the segmental head 19 will cooperate with the teeth 24 of thesegmental that forms a part of the brake unit to swing the plateoutyardly whereby to bring the brake element 28 into engagement with theinner face of the depending flange .4: formed at the outer edge of theturn table 1 whereby said turn table will be brought to a stop, thestopping of the turn tabla occurring when the reproducer not shown) tonearm has reached the innermost 511'0012 of the record that is supportedon the turn table. The sett'ng' of the stop mechanism to eiiect theactuation of the brake may be regulated by moving the head. 4:1 inwardlyalong the handle portion 21 so as to actuate the rod 39 and the latterwill in turn move the llsshaped trip member '36 to a predeterminedposition for cooperation with the cross member 14 carried by the outerend of the pivoted bar 12. In this manner the stop mechanism will swingon its a that carried hy the movable 1 ciated.

can housed in conjunction with theplaying of records or differentmakesand sizes. I The spring 31 will at all times under normal conditionshold the brakeelement 28 in an inoperative position and the parts willbe returned to their normal positions when the tone arm 5 is swungoutwardly to the outer edge portion or the turn table prior to theplayingof the record that is placed on the rotatable turn table. Thestop mechanism is initially set by swinging the tone arm inwardlywhereby to move the arm or bar 132 to the iosition where it will strikethe trip 36 after which the trip is moved part the way back to itsproper position. It will thus be seen from the foregoing descriptionthat I have provided a stop mechanism for phonographs which will at alltimes be' positiveand e'tlicient in its operation and due to itssimplicity the stop mechanism can be readily and easily attached tovarious types of phonographs without necessitating any materialalterations of the parts of the phonograph with which the stop mechanismis to be assolVhilc I have shown the preferred embodiment of myinvention it is to be understood that minor changes may be made thereinwithout departing from thespirit of the invention and the scope of theappended claims.

Having thus described the invention, what I claim as new is 1. Thecombination with a phonograph having a turn table, and a tone arm formovement across the turn table; of a stop mechanism for stopping theturn table, said stop mechanism including a pivoted brake unit arrangedadjacent the outer edge portion of the turn table and being normallyheld out of engagement therewith, a lever pivoted adjacent the pivotedbrake unit and being operatively connected therewith for simultaneousmovement, a trip carried by the pivoted lever tor actuating the same,means operable by the tone arm for actuating the trip and movethe brakeunit into an operative position, said mentioned means comprising anL-shaped member pivotally supported beneath the turn table, the outerend of the 7 longer arm ot said L-shaped member extendhaving a turntable, and a tone arm for move ment across the turn table; of astopmechanism for stopping the turn table, said stop mechanism including apivoted brake unit arranged adjacent the outeredge portion of theturntable and being normally held out or position, means carried by saidlever for setting the trip, said means including a manually adjustablerod arranged on thelever,said trip including an L 'sliaped member thatispivoted on the lever, the inner end of the lever being operativelyconnected with one of the arms of said L-shaped trip.

3. The combination with a phonograph having a turn table, and a tone armadapted to move across the turntable; of a stop mechanism for stoppingthe turn table, including a pivoted brake unit arranged adjacent theouter edge portion of the turn table, aturn' table engaging brakeelement carried by the unit and normally held out oi? engagement withthe turntable, a lever pivoted adjacent said unit, the adjacent portionsof the brake unit and the lever being formed with toothed segmental headportions that engage with each other to effect the simultaneous move.ment of said pivoted members, an adjustable trip member carried by thepivoted lever for actuating the latter, means operable by the tone armfor actuating said trip and move the brake element into an operativeposition, I said last mentioned means including a bar pivoted at itsinner end beneath the turn table,

the outer end of said bar being in engagement with the trip, andL-shaped member pivoted beneath the turn table, the outer end of thelonger arm of the said Lsshaped men'rber extending beyond the outer edgeof the turn table and being operatively connected with the movable tonearm, and a link operatively connecting the shorter arm of the L-shapedmember with the pivoted end of the bar.

4;. The combination with a phonograph having a turn table, and a tonearm adapted to move across the turn table; of a stop mechanism forstopping theturn table, including a pivoted brake unit arranged adjacentthe outer edge portion of the turn table, a turn table engaging brakeelement carried by the unit and normally held out of engagement with theturn table, a lever pivoted adjacent said unit, the adjacent portions ofthe brake unit and the lever being formed withthe toothed segmental headportions that engage with each other to effect the simultaneous movementof said pivoted members, an adjustable trip member carried by thepivoted lever for actuating the latter, means operable by the tone armfor actuating said trip and move the brake element into an operativeposition, said last mentioned means including a barpivoted at its innerend beneath the'turn table, the outer end of said bar being inengagement with the trip, and an L-shaped member pivoted beneath theturn table the outer end or" thelonger arm of the said shaped memberextending beyond the outer edge of the turn table and being operativelyconnected with the movable tone arni a link operatively connecting theshorter arm of the L-shaped member with the pivoted end of the bar andmeans for manually setting the trip to regulate the movementof the brakeelement to an operative position.

In testimony whereof I affix my signature.

THEODORE LOUIS SCHOWENGERDT.

